asus-laptop: add led support

Add led support, using generic led class.  Thomas Tuttle's patch
<http://lkml.org/lkml/2006/7/6/247> was very usefull.  We use
hotk->status to store led status because it's very hard to find
acpi method to get the right status...  To reduce the code,
I use a lot of macro (ASUS_LED, ASUS_LED_REGISTER, etc ...),
because the code is the same for all leds ...

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 4b1e367..87e1db8 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -74,6 +74,7 @@
         depends on X86
         depends on ACPI
 	depends on EXPERIMENTAL && !ACPI_ASUS
+	depends on LEDS_CLASS
         ---help---
 	  This is the new Linux driver for Asus laptops. It may also support some
 	  MEDION, JVC or VICTOR laptops. It makes all the extra buttons generate